Re: Simple Upgrading Question.
Oh, and I just noticed looking back through that it only supports low-profile cards, so any GTX or high end Radeon is a no-no.
The stock PSU is only 220W, which means that you can put pretty much nothing in without needing a bigger one. To have a bigger PSU you'll need a new case, and having a bigger case would mean you could get away with a regular profiled card. You just need to determine the form-factor of the motherboard, if it's mATX or ATX you should be alright. There's a high chance that it will be an obscure form factor though, slimline PCs nearly always are. So, unless you've got a board in there that supports a terrestrial form-factor, you're largely stuck.
EVGA SLI Micro Z68 // Intel i5-2500k // 8GB Corsair Vengeance 1866MHz // Overclocked 2GB MSI R9 270X // Corsair Carbide SPEC-03 // Kingston Hyper-X 120GB // 2TB WD Green + 500GB WD Black